Process of pulping and cleaning paper-stock.



J. D.'TOMPKINS. PROCESS OF PULPING AND APPLICATION FILED AUG. 29, 1906. RENEWED JU CLEANING PAPER STOCK.

Patented J an. 26, 1909. 5 22 l 4 2Z4 FIGQi.

/;SHEETSSHEET 1.

J. D. TOMPKINS. PROCESS OF PULPING AND CLEANING PAPER STOCK. APPLICATION FILED AUG. 29, 1906. RENEWED JULY 29, I908.

Patented Jan. 26, 1909.

2 SHEETS-SHEET 2.

A I TURN EY JOHN D. TOMPKINS, OF VA-LATIE, NEW YORK.

PROCESS OF PULPING AND CLEANING PAPER-STOCK.

Specification of Letters Patent.

Batented. Jan. 2c, 1909.

Ap Iicaticn filed August 29, 1906, Serial No- 832,472- 364N611 July 29, 1908. Serial No. 446,927.

To all whom it may concern:

Be it known that I, JOHN D. TOMPKINS, a citizen of the United States of America, residing at Valatie, Columbia county,State of New York, have invented a new and Improved Process of Pul ing and Cleaning Pa.-

er-Stock, of which tfie following is a specication.

This invention relates to a novel process of pulpi and cleaning per stock, old paper stoc r more particu ar y, and the object of the invention in its more complete realization is to automatically and economically provide for dusting, soaking and rough.- pul ing paper stock and separating strings and nails and bits of metal or other heavy foreign substances from the stock without violent or destructive mechanical attrition during preliminary separation of the fibers thus preser their strength, and while the stock has contmuous and uninterruted onward flow or movement, and then 'gesting or otherwise disintegrating the stock toput it in the best ossib e condition for mak ng from it at small expense new paper or paper board of high quality. I

The accompanying drawings forming part of this specification, illustrate preferred forms of apparatus to be hereinafter described in elucidation of the improved process, and

the novel features of the invention will be particularly pointed out in claims.

In the drawings Figure 1 is a central longitudinal vertical section of a preferred apparatus by using which the main soaking or roughul ing and cleaning steps or features 0 t e improved process may be practiced. Fig. 2 is a vertical cross-sectional view of this ap aratus, taken on the line a/a in Fig. 1. i 3 is an end elevation as seen from the discharge end of the paper stock cylinder. Fi 4 is alon itudinal partly broken out vertica sectiona v ew of such an apparatus in modified form. Fig. 5 is a vertical cross-sectional view, taken on. the line bb in Fig. 4. Fig. 6 is an enlarged detail view showing one of the plain curvedstock agitating teeth of the paper stock cylinder. of the end-hooked stock agitating and string catching and retaining teeth of said cylinder; and Fig. 8 is a somewhat diagrammatic elevation of a paper stock plant the operathe appended Fig. 7 is a detail view showing one.

tion of' which involves all steps or sta es of the complete process herein described and claimed.

Although this. invention in one or more of its steps or stages may be practiced by using various forms of ap aratus, a preferred paper stock pul 'ing an cleaning a paratus is. shown 1n igs. 1, 2 and 3 of the drawings, in which the numeral 1 indicates an openended stock receiving cylinder made with front and rear end. s 2 3., connected cf}- erably by longitudina' two-part metal are 4; and a pervlous cylinder Wall 5, preferably made of Wire netting fixed to the bars. 4, and preferably between their inner and outer parts. The rear 3 preferably has an annular flange forme with a radial-portion 6. which sufficiently retards discharge of the. rou h-prulped and partially cleaned paper stoc cm or over the longitudinal spout portion 7 of the ring flange.

The stock cylinder may be sustained in any approved manner and for revolution over a tank 8 into which hot or cold water or other pulp treating fluid 9 rises to proper level to assure rotation of the lower side or part of the cylinder in and throu h the. fluid. lhe cylinder is shown supporte at its end, rings upon anti-friction rollers 10 fixed to shafts 11, and the cylinder is rotated preferably by two pinions 12 fixed to a shaft 13 and enga ing gear teeth 14 formed on or fixed to t e end rings 2, 3. Any suitable.

chute or hopper 15 conducts the aper stock into the 0 under. Fluid may is supplied to the tan 8 in any approvedmanner, and preferably through a pipe 16. having a valve 17 to which may be connected a float 18 which rests upon or in the fluid 9 in the tank 8 and automatically maintains the desired fluid level therein. A valved pipe 19 sup.- plies steam to the fluid to maintain it at any esired tem, erature.

The cylin er bars 4 preferably c series of inwardly projecting teeth or spikes 20. which alternatel 3 lift and drop the pa er stock and thus t oroughly agitate it wit the cylinder. A num er or series of these teeth,- preferably those at and toward the discharge end of the cylinder, have hook-- shaped ends. 21 which catch and retain or.-

. dinarily invisible strings or like fibrous foreign substances. in the soaked and partially reduced paper stock. Practically complete removal of strings is of the greatest importance in repreparing old paper stock, as such strings by accumulating seriously clog and often break stock refining machinery and also promote lumpy formations the reduction of which directly tends to violent disruption and pulverization and killing of the other stock fibers. It is preferred to have the series of string catching teeth 2021, extend from the discharge end of the cylinder forward for about one-half an arm's length so that the operator by reaching inward and forward with one hand may grasp the collected strings and remove them from the hooked teeth to maintain maximum working efficiency of the cylinder. These stock agitating and string catching teeth-are preferably arranged helically or in staggered relation around the cylinder In this preferred construction of the paper stock cylinder a series of fluid buckets 22 are arranged outside of the cylinder wall 5, and are held to the cylinder bars 4, and extend the full length of the cylinder. The inner walls of these buckets are shown lying about flush with the front faces or edges of the bars but the outer edges of the buckets project considerably farther to form prolonged fluid de taining lips, as more clearly shown inFig. 2

of the drawings. Each bucket preferably has a series of transverse partitions 23 which assure equable and copious supply of fluid for the entire length of the buckets notwithstanding the normal downward incline of the cylinder, and the partitions incidentally increase the stiffness and durability of the buckets. During rotation 'of the cylinder these buckets 22, in the preferred method of operation, automatically take portions of the fluid 9 from the tank 8 and repeatedly discharge them inward through the pervious cylinder wall 5, for continuously soaking the agitated paper stock within the cylinder, as hereinafter more fully explained.

At the discharge end of the cylinder 1,

there is preferably placed a transverse sink or trap 24 into whi fluid 25 may flow from the cylinder 1 with the treated aper stock as the latter is discharged from t e cylinder into the sink. Within the sink 24 is journaled a transversely ranging roller 26, ref-. erably armed with radial teeth 27 an rotated by a pulley 28 on the roller shaft 29. The periphery of the roller agitates and laterally spreads and forwardly impels the soaked and rough-pulped stock 30 discharged from the cylinder 1 and passing over the sink fluid 25 and the outer wall of the sink into a hopper 31 which conducts the pulp preferably to a paper stock digester ereinafter mentioned. Thefluid-charged sink .2425 and its roller 26, also aid the gravital discharge from the stock of nails or from the cylinder 1 for discharge into and from the upper part of the sink 24, and these 0 erations are further facilitated by the action of the roller teeth 27 which also perform the further important function of combing from the discharging stock strings not previously caught by the hooked teeth 2021 of the rotating cylinder.

Before particularly explaining the operation of this preferred paper stock pulper and cleaner shown in Figs. 1, 2 and 3 of the drawings, the general relative arrangement of various apparatus constituting a preferred complete plant for cleaning and soaking and repulping old paper stock, and shown in Fig. 8 of the drawings, will be briefly described as follows veyer 35 discharges the dusted and handcleaned dry stock into the hopper 15 of the cylinder 1 into which the stock falls for special treatment hereinafter explained. From this cylinder 1, the fluid-soaked and rough-pulped papgr stock passes'into the sink 24, from w ch the stock preferably passes into a hopper 31 which discharges the pulp into a digester 36 for further separation of the stock fibers. From this digester the treated stock passes preferably into a stuff-chest 37, but 1f desired the stock may be piped directly from the sink 24 into the chest 37. If it is desired to make the finer grades of aper or paper board, the stock is fed from t e chest 37 to a washing en ine 38 for further cleaning or refinement. f it is desired to make common wrap ing pa er or paper boards, the pulp may be con ucted directly from this stuff-chest to a paper machine or to a Jordan refining engine.

The continuous operation of the preferred soaker, pul er and cleaner shown in Figs. 1, 2 and 3 of t e drawings will now be explained. As the old paperstock, preferably after being operated upon by an ordinary duster, such as the one 32, is fed from the conveyer 31 into the chute 15, the stock enters the cylinder 1, now rotating in direction of the arrow 0, and falls into the fluid 9 at the bottom of the cylinder 8, and is caught by the cylinder bars 4 and teeth 20 which carry it upward and partly around the cylinder until it reaches a point where gravit causes it to drop from the teeth back into t e fluid.

like heavy foreign substances as the soaked I The helical arrangement of the cylinder and partlally reduced stock moves forward teeth, together with the downward incline 130 buckets 22 cream of th cylinder, gmdualiy moves the stock forward for discharge into the sink 24. The fluid 9 in the tank at the bottom of the to tat'ing c linder acts as a cushion receivin the shoe falling from the bars 4 and teet 20 and upper portions of the peripheral wall 5 of the cylinder. During of the stock in the fluid at the bottom 0 the ro- .tating cylinder and during lifting and a "tation of the stock by the cylinder teet 20 and their su porting bars 4, the rotating fi automatically while passing through the fluid 9 in the tank 8.

It will be s ecially noticed that immediately thebucets rise from the .fluid in the tank the forwardly prolon ed bucket lips, by temporarily retaining or amming the fluid, assure prom discharge of the bucket contents inward y through the pervious cylinder wall 5 both uniformly andoo-piously for the entire length of the cylinder. This prompt inward fluid discharge from the buckets first meets and re els any outflowing forward swash of fluid caused by rotation in and through the fluid cushion of the "cylinder bars and teeth and the stock adhering thereto, and said bucket discharge, by passing inwardly through the stock within t e cylinder, assures the continuous and thorough sprinkling and soaking of all the stock and especially that which is lifted by andis cling-1n to and falling from the cylinder teeth '20 an their su orting bars 4, while the bucket discharge a so loosens the raised stock fibers lodged on the cylinder teeth and bars and peripheral wall and thus facilitates gravital all of the stock fibers therefrom into the fluid cushion at the bottom of thecylinder. It will also be specially noticed that paperstock fibers which may be temporarily washed outward through the ervious cylinder wall 5 about at the water evel in the tank 8 by the forward swash of the pa er stock, will be cau ht by the long-lipped ucket-22 just rising rom said fluid level, and the Iprompt inward discharge from said rising ucket will return said outwashed fibers th-rou h the pervious wall 5 into the cylinder. 1%: will also be seen that any paper stock fibers which may possibly be washed outward through this wall by direct flow of fluid from any one of the rising buckets 22 will be caught by the following bucket and will be washed back again into the cylinder through its pervious wall 5 by the inward dischar e from said following rising bucket. The alaove named recovery or return within the stock cylinder by inflow thereto with the bucket dischar es of fine stock fibers which may temporari y be outwashed through the pervious cylinder wall by the sto ck's'w'ash'at or near the fluid level inthet ank, o-r'by fluid discharge from the risin buckets, or which may escape through't e wall by gravital fall from upper portionsof said walhrassures that escape of digests-r 36 and stuii-c stock fibers from the rotating cylinder into the fluid 9 in the tank 8, is avoided and fiber Waste is therefore practically prevented. As the stock under treatment in the cylinder reaches the zone of rotation of the hooked cylinder teeth 20-21, the hooks 21, by their crosspassage through the stock, catch the heretofore unremoved strings and retain them or the larger part of them. When the hooks sufliciently fill with such strings or substances, the rotation of the cylinder may or may not be stoped at discretion of the operator who will insert his hand at the disc arge opening of the cylinder to quickly remove the accumulated strings.

It is obvious that the soakin of the paper stock within the cylinder in t e tank fluid and the practically :contin-uous inward fluid discharge from the cylinder buckets for sprinkling, soaking and softening the stock in the cylinder, together with the agitation of the stock by the cylinder bars and teeth, and the falling of the soaked stock from the cylinder bars and teeth and wall into the tank fluid, assures very quick, thorough and continuous reliminary softening and separation of t e paper stock fibers without violent disintegration of them and therefore without shortening the length or impairing the strength of the fibers, and also without wasting te stock, and the stock while wet is put in the best possible condition for further automatic removal from it of strings, or of nails or other heavy foreign substances.

As the soaked and rough-pulped stock flows from the cylinder 1 into the upper part of the sink 24, nails or bits of metal gravitally fall from the stock into the sink while the onflowing stock is helped'for'ward and is s read laterally, and the gravital separation o nails also is facilitated, by the moving peri hery of the roller 26, aided materially by t e roller teeth 27, as the toothed roller is rotated at a speed considerably faster than that of the paper stock cylinder 1. The roller teeth 27 also catch and remove and comb out from the discharging stock strings which may have ossibly escaped removal by the hooked cyllinder teeth 2021. All strings which may esca e between or from the hooked cylinder teet 2021, will, by the cross-travel of said teeth through the stock mass, be laid transversely within the cylinder, and this makes it all the more certain that these remaining strings will be removed or combed out of the stock by being caught and retained by the roller teeth 27 which operate in the line of travel of the discharging stock as the toothed roller 36 impels the stock forward from the sink 24, and preferably to the hop er 31 conductin the soaked, rough-pulpe and fully cleaner stock to subsequently used pulp refining or preparing apparatus, such as the I est 37, shown in Fig.

8 of the drawings; Strings collecting on the washing 0 roller teeth 27 will be removed by hand, and the sink .24 will be cleared of nails or bits of metal at intervals, when the toothed roller is at rest.

The removal of unobserved strings and bits of metal or other foreign substances from the wet stock by the hereindescribed apparatus is ra id, thorough and continuous, and when to t is important feature is added the automatic and thorough soaking, agitation and softening of the stock as the stockhas continuous and uninterrupted onward flow ormovement, and without shortening the length or imppiring the stren th of the stock fibers, it is o vious that all t ese operations may be advantageously performed at minimum expense by the use of this simple apparatus, and before the stock is operated upon by a reducing, washing, beating or refining engine. It will be specially noticed that no hard string lumps remain in the roughpulped stock treated in this apparatus, and consequently there is little or no danger of destruction or killing of stock fibers by attritional pulverization which would be necessary to reduce such stringy lumps in any subsequently used pulp refining apparatus.

Economy in the use of fluid, hot or chemical fluid especially, is of rime importance in operating apparatus of t is class. The functrons automatically and continuously performed by this pa er stock pulping and cleaning apparatus ar transcend the mere paper ulp producing material, and include a .pre iminary soaking of the paper stock for softening and gently separatin its fibers, rough-pulping the stock, and reeing it from unobserved strings and nails and other foreign substances, and all without shortening or weakening the stock fibers, and prior to subjectin the stock to further refining influence. T ese aforesaid functions are each and all greatly facilitated by employing in this one simple apparatus shown in Figs. 1, 2, and 3 of the drawings, hot

or tepid water or fluid, which because of its repeated use by the inwardly discharging buckets 22, assures performance of all functions with a minimum water supply.

This apparatus, especially that shown in Figs. 1, 2 and 3 of the drawings, may be advantageously used for treating old newspapers or other printed or colored paper stock which, after being preferably acted upon by an ordinary duster, is fed into the cylinder 1 while it is rotating in a hot or warm acid solution 9 supplied to the tank 8. Any such old printed or colored paper stock is thoroughly soaked and the ink or color therein is effectually saturated and softened and dissolved and blended so that the fully reduced stock or pulp will have a uniform tint controlled by the preponderance of any particular color in the original old paper stock. It will be specially noticed that the stock fiber itself is softened and gently se arated Without injuring it, and all by a sing e passage of the stock through the cylinder 1, during which the stock is a itated and is ke t thoroughly soaked within t e cylinder by t e desired fluid or solution, and strings and nails and bits of metal are practically all removed.

By varying the speed of rotation of the paper stock cylinder, different classes of paper stock may be caused to travel through shown in Figs. 4 and 5 of the drawings,- the open-ended paper stock cylinder 39 has an impervious or solid peripheralwall 40, and the means carried by the cylinder for continuously and directly and unob'structedly discharging water or fluid upon the continuously advancing stock within the cylinder are buckets 41 arranged within the cylinder and preferably having transverse partitions 42, like the above named buckets 22. The buckets 41 may be fastened in any approved manner to the solid cylinder wall 40. Water or fluid may be supplied by a ipe 43 discharging into the cylinder with the stock fed thereto from the chute 15, and the hereinbefore mentioned fluid tank 8 is dispensed with. The stock agitating and string catching teeth 20*21, are held to the cylinder 1 wall 40 and may overlie the transverse partitions 42 of the buckets 41. The nail catching sink 24 and the pulp agitating-and combing toothed roller 2627, are arranged substantially as in the first described apparatus shown in Figs. 1, 2 and 3 of the drawings.

In operating this modified apparatus, the cylinder is fed at its charging open end with paper stock and water or fluid, and the buckets 41 repeatedly take up portions of the fluid confined at the bottom of the cylinder to a depth or level permitted by its open end rings, and the buckets repeatedly discharge said portions of the fluid upon the paper stock or material continuously advancing longitudinally within the cylinder until the soaked and treated stock is automaticall discharged at the'farther open end of the cyfinder into the upper part of the sink 2 1, whence it may be conducted by a hopper to a digester 36, or other pulp treating apparatus. Strings and nails are removed by the cylinder teeth 2021, the sink 24, and the toothed roller 26-27, substantially as hereinbefore described. The internal buckets 41, or equivalent internal means held to the openended cylinder, by repeatedly receiving fluid and discharging it upon the advancing stock being treated in the cylinder, make this modified apparatus in this respect operate subeiaser stantially like the preferredappantushaving 1 portions of. said fluid and discharging external brackets 22, as shown in. Figs. 1, 2

and 3 of the drawings.

B remembering the operative functions of te above described apparatus, the. variously combined steps or stages of this im-.

roved a er stock ulping and cleaning rocess s peiiified in thd appended claims be clearly understood without further detailed description.

I claim as my invention 2- 1. The hereindescribed process of continuously rough-pulpingfiaper'stock, consisting in subjecting forwar y moving stock to the dissolving influence of a fluid, and repeatedly raising portions of said fluid and dischar the same upon the advancing stock, substantially as set forth.

2. The hereindescribed process of continuously rough-pulping, aper stock, consisting in subjecting forward y moving stock to the dissolving influence of a fluid maintained at approximate level, and repeatedly raising portions of said fluid and discharging the same upon the advancing stock, substantially as set forth.

3. The hereindescribed process of continuously rough-pulping aper stock, consisting in subjecting forwardly moving stock to the dissolving influence of a fluid, agitating the advancing stock mass, and re eated'ly raising portions of said fluid and ischarging the same upon the advancing" agitated stock mass, substantially as set forth.

4. The herindescribed process of continuously rough-pulpingfiaper stock, consisting in subjecting forwar y moving stock to the dissolving influence of a fluid maintained at approximate level, agitating the advancing stock mass, and repeatedly rais' portions oi said fluid above the fluid lefi and dis char the same u on the advancin a tate stock mass, substantially as set %or&.

5. The hereindescribed process of continuously rough-pulpingdpaper stock, consisting an in subjecting forwar y moving stock to the dissolving influence of a fluid maintained at approximate level, lifting portions of the stock above said fluid level and then dro ping them into the fluid, and repeated y raising portions of said fluid and discharging the same upon the advancing agitated stoc mass, substantially as set forth.

6. The hereindescribed process of continuously rough pulpingfiaper stock, consisting in subjecting forwar y moving stock to the dissolving influence of a fluid, and repeatedly raising portions of said fluid and discharging the same upon and inwardly throu h the advancin stock, substantially as set orth.

7. T e hereindescribed process of continuously rough-pulping paper stock practically without loss of fibers, consistin 1n subjecting forwardly moving stock to t e dissolving influence of a fluid, and repeatedly raising same upon and inwardly through the ad.- vancin stock, and recoverin by a subseguent inward fluid flow or discharge stock berspossibly esca ing under influence of a prior fluid flow or charge, substantially as set forth.

8.. The hereindescribed process of continuously rough-pulping aper stock, consisting in subject-mg forwar y moving stock to the dissolving influence of a fluid maintained at approximate level, and repeatedly raising portions of said fluid and discharging the same upon and inwardl through the advancin stock, substantially as set forth.

9. T e herei-ndescribed process of continuously rough-pul ing paper stock practically without loss of fi ers, consisting in subjecting forwardly moving stock to the dissolving influence oi a fluid maintained at approximate. level, and re eatedly raising portions of said fluid and charging the same inwardly through the advancing stock, and recovering by a subsequent inward fluid flow or disc arge stock fibers possibl. escaping under influence of a prior fluid 0W or discharge, substantially as set forth.

10. The hereindescribed process of continsame upon and inwardly through the advancin agitated stock mass, and recover by a se uent inward fluid flow or d lmrge stock hers ossibly escaping under influence of a prior uid flow or discharge, substantially as set forth.

12. The hereindescribed process of continuously -rough-pul ing pa r stock, consisting in subjecting orward y moving stock to the dissolving influence of a fluid maintained at approximate level, agitating the advancing stock mass, and re eatedly raising portions of said fluid and ischarging the same inwardly through the advancin a itated stock mass, substantially as set-flort r.

13. The hereindescribed process of con tinuously rough-pulping aper stock practically without loss of Here, consisting subjecting forwardly movin stock to the dissolving influence of a flui maintained at approximate level, agitating the advancing,

the-

and inwardly throu h the advancing agitated stock mass, and recovering by a subseuent inward fluid flow or discharge stock fibers ossibly escaping under influence of a prior uid flow or discharge, substantially as set forth.

14. The hereindescribed process of continuously rough-pul ing paper stock, consisting in subjecting forward y moving stock to the dissolving influence of a fiuid maintained at a proximate level, lifting portions of the stoc above said fluid level and then dropping them into the fluid, and repeatedly raising portions of said fluid and discharging the same upon and inwardly through the advancing agitated stock mass, substantially'as set forth.

'15. The hereindescribed process of continuously rough-pulping paper stock practically without loss of fibers, consisting in subjecting forwardly movin stock to the dissolving influence of a fluicf maintained at approximate level, lifting portions of the stock'above said fluid level and then dropping them into the fluid, and repeatedy raismg portions of said fluid and dischargmg the same inwardly through the advancing agitated stock mass, and recovering by a subsequent inward fluid flowor discharge stock fibers possibly escaping under in fluence of a prior fluid flow or discharge, substantiall T as set forth.

16. The' ereindescribed process 'of continuously and automatically treating paper stock for removing strings therefrom prlor to treating the stock in a reducing, washing, beating or refining engine, consisting in soaking advancing paper stock, and transversely and permanently removing strings from the advancing fluid-soaked stock mass,

substantiall as set forth.

17. The ereindescribed process of con tinuously treating paper stock forautomatically removing strings therefrom, consisting in soaking forwardly moving stock, laying the strings in the moving stock mass transversely or across the line of travel of the soaked stock, and then combing the stock mass in direction of its line of travel to catch the transversely laid strings, substantially as set forth.

18. The hereindescribed process of continuously treating paper stock for removing strin s therefrom, consisting in soaking forwardTy traveling stock, and transversely and permanently removing strings from the forwardly traveling fluid-soaked stock mass while laying remaining strings transversely or across the line of travel of the stock mass, and then combing the stock mass in direction of its line of travel to catch said transversely laid strings, substantially as set forth.

19. The hereindescribed process of continuously and automatically treating old paper stock prior to treatment of it in a reducing, washing, beating or refining en ine, consisting in soaking and partially dismtegrating or pulping said stock, and dischar ing the paper stock mass, and immediate y agitating and forwardly impelling said discharging partially pulped stock mass in the atmosphere, thereby facilitating gravital separation from said discharging stock of nails or other heavy foreign substances, substantially as set forth.

.. 20. The hereindescribed process of contin-' uously and automatically treating paper stock prior to treatment of it in a reducing, washing, beating or refining engine, consisting in soaking and partially disintegrating or pulping said stock, and advancin and discharging the paper stock mass, an then agitating and forwardly impelling said discharging partially ulped stock mass and automatically com ing the same, thereby facilitating removal of strings from the discharging stock and promoting gravital separation from it'of nails or other hea foreign substances, substantially as set forf 21. The hereindescribed process of continuously and automatically treating paper stock prior to treatment of it in a reducing,

washing, beating or refining engine, consisting in soaking and partially disintegrating or pulping said stock, and advancing and discharging the paper stock mass, and transversely and permanently removing st ings from the advancing partially pul ed stock mass, and agitating and forwar y'impelling said discharging stock mass in the atmosphere, thereby facilitating gravital separation from said discharging stock of nails or other heavy foreign substances, substantially as set forth.

22. The hereindescribed process of continuously treating pa er stock, consisting in soaking and artlal y disintegrating or pul ing said stoc and forwardly advancing t 0 same, and transversely and permanently removing strings from the traveling partially pulped stock mass while laying remannn strings transversely or across the line 0 travel of said mass, then discharging the stock mass, then agitating and forwardly impelling the discharging stock mass thereby facilitating gravital separation therefrom of nails or other heavy foreign substances, and

combin the discharging stock mass in direction of 1ts line of travel to catch the strings gaidlitransversely therein, substantially as set ort 23. The hereindescribed process of automatically repulping old paper stock, consisting in imparting a continuous and uninterrupted forward movement to the stock, dusting said advancing stock, and soaking and partially disintegrating or rough-pulping the advancing dusted st'ock prior to its treatment in a reducing, washing, beating or refining engine, substantially as described.

24. The hereindescribed process of automatically repulping old paper stock, consisting in imparting a continuous and uninterrupted forward movement to the stock, dusting said advancing stock, soaking and partially disintegrating or rough-pulping the advancing dusted stock, and removing therefrom strings and nails or other heavy foreign substances prior to its treatment in a reducing, washing, beating or refining engine, substantially as described;

25. The hereindescribed process of automatically re'pulping old paper stock, consisting inimparting a continuous and uninterrupted forward movement to the stock, dusting said advancing stock, soaking and partiallydisintegrating or rough-pulping the advancing dusted stock, and then digesting said stock prior to its treatment in a reducing,

Washing, beating or refining engine, substantially as described. Y

26. The hereindesoribed process of automatically repulping old paper stock, consisting in imparting a continuous and uninterrupted forward movement to the stock, dusting said advancing stock, soaking and partially disintegrating or rough-pulping the advancing dusted stock and removing therefrom strings and nails or other heavy foreign substances, and then digesting said stock prior to its treatment in a reducing, washing, eating or refining engine, substantially as described.

JOHN D. TOMPKINS. 

